The National Measurement Laboratories are the source of measurements standards and techniques for the scientific community and are dedicated to establishing and maintaining a consistent international system of units. This requires measurement standards and their dissemination with the lowest possible uncertainty to the scientific community and industry.
To accomplish this careful attention to detail is required in measurement systems designed to be as close to first principles as possible and attaining the best possible measurement resolution by eliminating disturbing influences such as extraneous electrical interference. the aim of this book is to offer guidance and best practice in electrical measurements applicable to any required accuracy level.
The book describes measurements and application of sensitive electrical circuits, with examples of the ultimate in noise-matching and interference elimination, in precise and accurate voltage, current and power measurements demonstrating the elegance, flexibility and utility of coaxial AC bridges. It also serves to up-date an earlier publication by one of the authors and includes more recent work on AC measurements of quantum Hall resistance to provide a primary quantum standard of impedance and the extension of coaxial networks to higher frequencies.
List of Figures
Abstract
Preface
Acknowledgements
Chapter 1 : Introduction
Chapter 2 : Sources, Detectors, Cables and Connectors
Chapter 3 : The Concept of a Low-Frequency Coaxial Network
Chapter 4 : Impedance Measurement
Chapter 5 : General Principles of Accurate Impedance Measurement
Chapter 6 : Impedance Standards
Chapter 7 : Transformers
Chapter 8 : General Considerations About Impedance Comparison Networks
Chapter 9 : Bridges to Measure Impedance Ratios
Chapter 10 : Application of Interference-Free Circuitry to Other Measurements
Appendix I
Appendix II
Appendix III
Appendix IV
Index
